Micromalthus has perhaps the most convoluted life cycle of any animal, involving adults that sometimes look like larvae, female forms that either give live birth or lay a single egg, larvae that start life as highly motile speedsters and grow into sluggish legless grubs (shown here), and males that must cannabilize their own mothers in order to mature.
More details here: The life cycle of Micromalthus debilis
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This image was captured with a Canon EOS 20D, using a Canon MP-E 65mm 1-5x Macro Lens.